Translation of "Purifiers" in Japanese

Please exercise every caution against cowboy salesmen of water purifiers and fraudulent-test sales.

くれぐれも浄水器の悪質訪問販売業者や無料点検商法にはご注意ください。

There are frequent instances of malicious door-to-door selling, such as pushing water purifiers on people after carrying out water quality tests without permission.

勝手に水質検査を行ったあげく浄水器を売りつけるなど、悪質な訪問販売が多発しています。